It is an ansible inventory file to configure packages on an CentOS 7 VM.

centos7-playbook.yml

---
  - hosts: nodes
    become: true
    tasks:
      - name: Create a linux user devops
        command: useradd devops
        ignore_errors: yes # ignore is true because i was testing the system and if the user already exists it was causing errors
        register: command_result
        failed_when: 
          - command_result.rc == 9
          - "'exists' in command_result.stderr"
  
      - name: Install yum-utils, bzip2(bzip), git, wget, openssl-devel, (apache)httpd packages
        package: 
          name:
            - yum-utils
            - bzip2
            - git
            - wget
            - openssl-devel
            - httpd
          state: present
        ignore_errors: yes # if packages already exists
  
      - name: Add Docker repo
        get_url:
          url: https://download.docker.com/linux/centos/docker-ce.repo
          dest: /etc/yum.repos.d/docer-ce.repo
        become: yes # Become. Ansible allows you to 'become' another user, different from the user that logged into the machine (remote user)
  
      - name: Install Docker
        package:
          name: docker-ce
          state: latest
        become: yes
  
      - name: Start Docker service
        service:
          name: docker
          state: started
          enabled: yes
        become: yes
      
      
      - name: Create "docker" group
        group:
          name: docker
          state: present
        tags:
          - docker
        ignore_errors: yes
      
      - name: Add remote "devops" user to "docker" group
        user:
          name: devops
          group: docker
          append: yes
        tags:
          - docker
        ignore_errors: yes
  
      - name: Ensure docker-compose is installed and available
        shell: curl -L https://github.com/docker/compose/releases/download/1.7.0-rc1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
      
      - name: Make docker compose file executable
        file:
          path: /usr/local/bin/docker-compose
          mode: u=rwx,g=rwx,o=rwx